I asked to have one installed on the underside of cabinets in the past on every one of my 4 Escapes, Reace always said no because you lose the use of the cabinet due to the wiring and 12v outlet extending into the space. Originally even the 12v outlets mounted on the vertical cabinets had open backs which caused issues. Later they started placing a panel over the area of those to prevent shorts. But you could always do a surface mount after taking delivery, if need be, just ask for a 12v wire run to the area.
Due to the pandemic, my life now exists of only 3 days, yesterday, today, and tomorrow. Everything else has been forgotten!